#include <bits/stdc++.h>

using namespace std;

class Solution {
public:
    vector<int> shuffle(vector<int>& nums, int n) {
        vector<int> ans(2*n);
        for (int i = 0; i < 2*n; i += 2)
        {
            ans[i] = nums[i];
            ans[i+1] = nums[i / 2];
        }
        return ans;
    }
};

int main()
{

    return 0;
}